use super::Paper;
pub fn search(base_url: &str, query: &str, max_results: u32) -> Result<Vec<Paper>, String> {
let encoded = super::encode_query(query);
let url = format!(
"{}/search?query={}&pageSize={}&format=json&resultType=core",
base_url, encoded, max_results
);
let mut last_err = String::new();
for attempt in 0..3 {
if attempt > 0 {
std::thread::sleep(std::time::Duration::from_millis(100 * (1 << attempt)));
}
match ureq::get(&url).call() {
Ok(resp) => {
let body = resp
.into_body()
.read_to_string()
.map_err(|e| format!("Failed to read response: {}", e))?;
return parse_search_response(&body);
}
Err(ureq::Error::StatusCode(429)) => {
last_err = "rate limited (429)".to_string();
continue;
}
Err(ureq::Error::StatusCode(code)) if code >= 500 => {
return Err(format!("Server error: {}", code));
}
Err(e) => {
return Err(format!("HTTP error: {}", e));
}
}
}
Err(last_err)
}
pub fn parse_search_response(json: &str) -> Result<Vec<Paper>, String> {
let root: serde_json::Value =
serde_json::from_str(json).map_err(|e| format!("JSON parse error: {}", e))?;
let results = root["resultList"]["result"]
.as_array()
.ok_or("missing 'resultList.result' array")?;
let mut papers = Vec::new();
for item in results {
let title = item["title"].as_str().unwrap_or("").to_string();
if title.is_empty() {
continue;
}
let id = item["id"].as_str().unwrap_or("").to_string();
let authors: Vec<String> = item["authorList"]["author"]
.as_array()
.map(|arr| {
arr.iter()
.filter_map(|a| a["fullName"].as_str().map(|s| s.to_string()))
.collect()
})
.unwrap_or_default();
let doi = item["doi"].as_str().map(|s| s.to_string());
let abstract_text = item["abstractText"].as_str().map(|s| s.to_string());
let year = item["pubYear"]
.as_str()
.and_then(|s| s.parse::<u16>().ok());
let citations = item["citedByCount"].as_u64().map(|n| n as u32);
let is_oa = item["isOpenAccess"]
.as_str()
.map(|s| s == "Y");
papers.push(Paper {
id,
title,
authors,
abstract_text,
year,
doi,
url: item["fullTextUrlList"]["fullTextUrl"]
.as_array()
.and_then(|arr| arr.first())
.and_then(|u| u["url"].as_str())
.map(|s| s.to_string()),
pdf_url: None,
venue: item["journalTitle"].as_str().map(|s| s.to_string()),
citations,
fields: vec![],
open_access: is_oa,
source: "europepmc".to_string(),
});
}
Ok(papers)
}
#[cfg(test)]
mod tests {
use super::*;
const FIXTURE: &str = include_str!("../../tests/fixtures/europepmc_search.json");
#[test]
fn parse_returns_ok() {
let result = parse_search_response(FIXTURE);
assert!(result.is_ok());
}
#[test]
fn parse_papers_not_empty() {
let papers = parse_search_response(FIXTURE).unwrap();
assert!(!papers.is_empty());
}
#[test]
fn parse_source_is_europepmc() {
let papers = parse_search_response(FIXTURE).unwrap();
for p in &papers {
assert_eq!(p.source, "europepmc");
}
}
#[test]
fn parse_title_not_empty() {
let papers = parse_search_response(FIXTURE).unwrap();
for p in &papers {
assert!(!p.title.is_empty(), "paper {} has empty title", p.id);
}
}
#[test]
fn parse_authors() {
let papers = parse_search_response(FIXTURE).unwrap();
let with_authors: Vec<_> = papers.iter().filter(|p| !p.authors.is_empty()).collect();
assert!(!with_authors.is_empty(), "no papers with authors");
}
#[test]
fn parse_doi() {
let papers = parse_search_response(FIXTURE).unwrap();
let with_doi: Vec<_> = papers.iter().filter(|p| p.doi.is_some()).collect();
assert!(!with_doi.is_empty(), "no papers with DOI");
for p in &with_doi {
assert!(p.doi.as_ref().unwrap().starts_with("10."));
}
}
#[test]
fn parse_citations() {
let papers = parse_search_response(FIXTURE).unwrap();
for p in &papers {
assert!(p.citations.is_some(), "paper {} missing citations", p.id);
}
}
#[test]
fn parse_abstract() {
let papers = parse_search_response(FIXTURE).unwrap();
let with_abstract: Vec<_> = papers.iter().filter(|p| p.abstract_text.is_some()).collect();
assert!(!with_abstract.is_empty(), "no papers with abstract");
}
#[test]
fn parse_year() {
let papers = parse_search_response(FIXTURE).unwrap();
let with_year: Vec<_> = papers.iter().filter(|p| p.year.is_some()).collect();
assert!(!with_year.is_empty(), "no papers with year");
for p in &with_year {
assert!(p.year.unwrap() >= 2000);
}
}
#[test]
fn parse_open_access() {
let papers = parse_search_response(FIXTURE).unwrap();
let with_oa: Vec<_> = papers.iter().filter(|p| p.open_access.is_some()).collect();
assert!(!with_oa.is_empty(), "no papers with open_access");
for p in &with_oa {
let _ = p.open_access.unwrap(); }
}
#[test]
fn search_returns_papers() {
let mut server = mockito::Server::new();
let mock = server
.mock("GET", mockito::Matcher::Any)
.with_status(200)
.with_body(FIXTURE)
.create();
let papers = search(&server.url(), "test", 3).unwrap();
assert!(!papers.is_empty());
mock.assert();
}
#[test]
fn search_request_path_contains_search() {
let mut server = mockito::Server::new();
let mock = server
.mock("GET", mockito::Matcher::Regex("/search".to_string()))
.with_status(200)
.with_body(FIXTURE)
.create();
let _ = search(&server.url(), "test", 3);
mock.assert();
}
#[test]
fn search_request_contains_page_size() {
let mut server = mockito::Server::new();
let mock = server
.mock("GET", mockito::Matcher::Regex("pageSize=3".to_string()))
.with_status(200)
.with_body(FIXTURE)
.create();
let _ = search(&server.url(), "test", 3);
mock.assert();
}
#[test]
fn search_request_contains_format_json() {
let mut server = mockito::Server::new();
let mock = server
.mock("GET", mockito::Matcher::Regex("format=json".to_string()))
.with_status(200)
.with_body(FIXTURE)
.create();
let _ = search(&server.url(), "test", 3);
mock.assert();
}
#[test]
fn search_request_contains_result_type_core() {
let mut server = mockito::Server::new();
let mock = server
.mock("GET", mockito::Matcher::Regex("resultType=core".to_string()))
.with_status(200)
.with_body(FIXTURE)
.create();
let _ = search(&server.url(), "test", 3);
mock.assert();
}
}